NEET (UG)

Practice Test 1 — Cell Cycle and Cell Division

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

DNA replication takes place during the:

Solution: DNA is replicated in S phase.

Question 2

The quiescent stage in which cells stop dividing is:

Solution: G0 is the quiescent stage.

Question 3

Mitosis maintains the chromosome number and is therefore:

Solution: Mitosis is equational.

Question 4

Chromosomes are most condensed and aligned at the equator during:

Solution: Metaphase: chromosomes align at the plate, most condensed.

Question 5

Crossing over occurs in which substage of prophase I?

Solution: Crossing over occurs in pachytene.

Question 6

Homologous chromosomes separate during:

Solution: Homologues separate in anaphase I (reductional).

Question 7

The number of haploid cells produced at the end of meiosis is:

Solution: Meiosis yields four haploid cells.

Question 8

In an animal cell, cytokinesis occurs by a:

Solution: Animal cells use a cleavage furrow.

Section B — Assertion & Reason

Question 9

A: Although DNA content doubles in S phase, the chromosome number does not change.
R: The two DNA copies remain joined as sister chromatids of the same chromosome.

Solution: Joined sister chromatids count as one chromosome, so number is unchanged — R explains A.

Question 10

A: Meiosis halves the chromosome number.
R: A single round of DNA replication is followed by two successive divisions.

Solution: Two divisions after one replication is what halves the number — R explains A.

Question 11

A: Sister chromatids separate during anaphase I of meiosis.
R: Meiosis I is a reductional division.

Solution: A is false — in anaphase I the HOMOLOGUES separate, not the chromatids; R (reductional) is true.

Question 12

A: Meiosis is a source of genetic variation.
R: Crossing over and independent assortment occur during meiosis.

Solution: Crossing over and independent assortment generate the variation — R explains A.